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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        {
            let arr = [10, 20, 0, 1, 9, 100];
            for (let i = 0; i < arr.length - 1; i++) {
                for (let j = 0; j < arr.length - 1 - i; j++) {
                    if (arr[j] < arr[j + 1]) {
                        let temp = arr[j];
                        arr[j] = arr[j + 1];
                        arr[j + 1] = temp;
                    }
                }
            }
            console.log(arr);
        }
        {
            let arr = [10, 20, 0, 1, 9, 100];
            for(let i =0;i<arr.length -1;i++){
                for(let j =0;j<arr.length -i-1;j++){
                    if(arr[j]<arr[j+1]){
                        //解构赋值
                        [arr[j],arr[j + 1]] = [arr[j + 1],arr[j]];
                    }
                }
            } 
            console.log(arr);
        }
    </script>
</body>

</html>